Pre-Cambrian igneous rocks of the Unkar terrane, Grand Canyon of the Colorado, Arizona
By: by Charles D. Walcott with notes on the petrographic character of the lavas by Joseph Paxson Iddings.
Contributors: Iddings, Joseph Paxson, 1857-1920.
Publisher: GPO
Published: 1895
Place of publication: Washington, D.C
Language: eng
Number of pages: 27
Subjects: Geology, Stratigraphic -- Precambrian.; Rocks, Igneous.; Geology -- Arizona.; Petrology -- Arizona.